Google's system strives to elevate in search results the Web sites with content most relevant to a request. Because Google handles far more search requests than its rivals, its ranking system can make or break Web sites without a well-known domain name.

With the stakes so high, Web sites assigned a low Google ranking are constantly trying to elevate their standing, and an entire cottage industry has formed surrounding search engine optimization. Some sites resort to dirty tricks, hoping the shenanigans will fool Google into highlighting their Web links.

Google regularly tweaks its search formula to weed out the mischief makers _ sometimes called "Black Hats." In the worst cases, Google exiles the manipulative Web sites, a practice that has become known as being sent to "the sandbox" for the equivalent of a children's time out.

http://www.breitbart.com/news/2006/03/17/D8GDKG900.html